Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba7171769aeff7da…

MALICIOUS

PDF

83.4 KB Created: 2021-07-25 03:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4077f000b5b850ae0ed9d91fc0b6e064 SHA-1: ada8d02862fe448585db69b9de0e22803ceb96ff SHA-256: ba7171769aeff7daa102e748d24882fbabcd619085880666d59153abbcb026cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm used for phishing or malware distribution. The document body is heavily obfuscated, but the presence of PDF link farm heuristics indicates an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://poiskvod.ru/images/file/fefisodopijukafazoj.pdf
    • https://aduanaldelvalle.com/userfiles/file/sisamew.pdf
    • http://curry-box-deluxe.de/userfiles/file/roxisotajomibusanarepow.pdf
    • http://jar-ted.pl/file/powuwodubisabike.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3c22d141cf---baliwelizotixif.pdf
    • http://amctop.com/board_data/editor_img/file/202105120952.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f957456e5---49174468243.pdf
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/kh5t6vc2sak596tcu775d52g9v/meredixatenekukiwavik.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160725b2194eef---34505242850.pdf
    • http://serdceprirody.ru/userfiles/file/jemezuwiv.pdf
    • http://sashtraayurveda.com/ckfinder/userfiles/files/rubuwa.pdf
    • http://imhkayseri.com/resimler/files/mobuk.pdf
    • https://pbchistoryonline.org/uploads/file/rajugidumosalokez.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b335b237eb3---gezeto.pdf
    • http://orchid-daikanyama.com/userfiles/file/romevizeluvolag.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/d449263d782c2ed50e24288de26e5ad5/gomifowaposenurumizonad.pdf
    • https://myshalewell.com/userfiles/file/90064811515.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a87567d80de---16724318071.pdf
    • http://styropapex.pl/userfiles/file/56583313364.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be35c18e82e---69850820008.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d9031e32---lubin.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/5s6438if0kv3pmj3fl3ntrok96/bevetodexalame.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/3ede1c77e3ccbf30b74dbe649c46c0dd/76729740107.pdf
    • http://studiogaleazzo.eu/userfiles/files/84318187795.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/jilipuz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=master+sanitary+price+list+pdf+2021
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1a1.bin
63fa585eff5e7f8d5227496e6aad0d819cd6e5ac2605b1637a3402daa4fc431c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 10892 bytes
font_01_sfnt_off0000fb1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16792 bytes
font_02_sfnt_off00011330.bin
023e76daa2ecb3cd27b96c02dee887184402c306f5dca18124caf9a469f9b7f4
pdf-font-stream PDF embedded font (sfnt) at offset 0x11330 16820 bytes